I recently went to a temp agency for work and they sent me to a company where I am doing some light secretarial work such as answering phone calls, photo copying, and typing letters, but I am not happy with the job. Is it possible to go back to the temp agency to ask for a different job? Will asking have affect my chances of getting a full time job?

You should have no problem going to the temp agency and asking for another job assignment. I recommend explaining your reasons for leaving the job so they may find one that is more compatible to your needs. However, I would be careful not to leave too many temp jobs because you may appear too difficult and hard to satisfy, which can be a problem. Just make sure that you know what the new temp job entails so you will know ahead of time if the job is good for you.